When your childhood friend commits the dead. Usually done after confessing to her that you either love her or will always be her dearest friend. And you can never change what happens.
Never.
Never.
Never..

n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.